Hi,
I have used a Fluke DMM with a Max/Min capture feature to measure the ringing voltage, not only red to green, but also red to ground (and green to ground).
To my surprise, the red wire to ground ringing voltage (some telephone equipment on line) was 93.2 VAC !! The green wire to ground ringing voltage was 36.4VAC. Note: Telephones are ringing.
Is this normal?
Thank You in advance, John